CentOS server refusing all connections except for ssh telnet and http

For some reason my CentOS VPS refuses all connections except for HTTP, SSH and Telnet. Whenever I try to connect to a port such as 25 (SMTP) or even a random port such as 225 I get a connection refused error :S
netstat -ap shows that the server is listening and iptables is turned off.

However I can interface with the same ports on the server through telnet...

# iptables -L
Chain INPUT (policy ACCEPT)
target     prot opt source               destination         

Chain FORWARD (policy ACCEPT)

target     prot opt source               destination         

Chain OUTPUT (policy ACCEPT)
target     prot opt source               destination    

# netstat -an | fgrep LISTEN
tcp        0      0 0.0.0.0:25                  0.0.0.0:*                   LISTEN      
tcp        0      0 0.0.0.0:225                 0.0.0.0:*                   LISTEN      
tcp        0      0 :::22                       :::*                        LISTEN      
tcp        0      0 :::80                       :::*                        LISTEN      

unix  2      [ ACC ]     STREAM     LISTENING     169786017 /tmp/.font-unix/fs7100
unix  2      [ ACC ]     STREAM     LISTENING     169786045 /var/run/saslauthd/mux

This is the error message i'm getting from my php script. My PHP script works fine with every other SMTP server I've come across
Warning: fsockopen() [function.fsockopen]: unable to connect to :25 (Connection refused)

Answer

It looks like there is something upstream of your VPS that is blocking access except for the ports noted. You should contact your VPS provider and ask them about it.